Travel Time Optimization On I 285 With Improved Variable Speed Limit Algorithms And Coordination With Ramp Metering Operations
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Travel Time Optimization On I 285 With Improved Variable Speed Limit Algorithms And Coordination With Ramp Metering Operations
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Author : Jorge Andrés Laval
language : en
Publisher:
Release Date : 2019
Travel Time Optimization On I 285 With Improved Variable Speed Limit Algorithms And Coordination With Ramp Metering Operations written by Jorge Andrés Laval and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Express highways categories.
Preparations For Field Testing Of Combined Variable Speed Advisory Vsa And Coordinated Ramp Metering Crm For Freeway Traffic Control
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Author : Xiao-Yun Lu
language : en
Publisher:
Release Date : 2014
Preparations For Field Testing Of Combined Variable Speed Advisory Vsa And Coordinated Ramp Metering Crm For Freeway Traffic Control written by Xiao-Yun Lu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Electronic traffic controls categories.
Design Field Implementation And Evaluation Of Adaptive Ramp Metering Algorithms
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Author : Dengfeng Sun
language : en
Publisher:
Release Date : 2005
Design Field Implementation And Evaluation Of Adaptive Ramp Metering Algorithms written by Dengfeng Sun and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Algorithms categories.
The main objectives of Task Order 4136 are (1) the design of improved freeway on-ramp metering strategies that make use of recent developments in traffic data collection, traffic simulation, and control theory, and (2) the testing of these methods on a 14-mile segment of Interstate 210 Westbound in southern California. To date, the major accomplishments of this project include (i) the development of a complete procedure for constructing and calibrating a microscopic freeway traffic model using the Vissim microsimulator, which was applied successfully to the full I-210 test site, (ii) a simulation study, using the calibrated Vissim I-210 model, comparing the fixed-rate, Percent Occupancy, and Alinea local ramp metering schemes, which showed that Alinea can improve freeway conditions when mainline occupancies are measured upstream of the on-ramp (as on I-210 and most California freeways), as well as when occupancy sensors are downstream of the on-ramp, (iii) development of computationally efficient macroscopic freeway traffic models, the Modified Cell Transmission Model (MCTM) and Switching-Mode Model (SMM), validation of these models on a 2-mile segment of I-210, and determination of observability and controllability properties of the SMM modes, (iv) design of a semi-automated method for calibrating the parameters of the MCTM and SMM, which, when applied to an MCTM representation of the full I-210 segment, was able to reproduce the approximate behavior of traffic congestion, yielding about 2% average error in the predicted Total Travel Time (TTT), and (v) development of a new technique for generating optimal coordinated ramp metering plans, which minimizes a TTT-like objective function. Simulation results for a macroscopic model of the 14-mile I-210 segment have shown that the optimal plan predicts an 8.4% savings in TTT, with queue constraints, over the 5-hour peak period.
Exploring The Potential Of Combining Ramp Metering And Variable Speed Limit Strategies For Alleviating Real Time Crash Risk On Urban Freeways
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Author : Kirolos Maged Haleem
language : en
Publisher:
Release Date : 2007
Exploring The Potential Of Combining Ramp Metering And Variable Speed Limit Strategies For Alleviating Real Time Crash Risk On Urban Freeways written by Kirolos Maged Haleem and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
In summary, Ramp Metering was more beneficial at congested situations, while Variable Speed Limits were more beneficial at free-flow conditions. At conditions approaching congestion, the combination of Ramp Metering and Variable Speed Limits produced the best benefits. These results illustrate the significant potential of ITS strategies to improve the safety and efficiency of urban freeways.
Ramp Metering Algorithms And Approaches For Texas
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Author :
language : en
Publisher:
Release Date : 2004
Ramp Metering Algorithms And Approaches For Texas written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Algorithms categories.
The primary objective of this project was to compare ramp metering algorithms and develop guidelines for improving ramp metering operations in Texas. As part of this research project, researchers collected data at several sites in Houston, Texas. Data analysis showed that many congested freeways are facing heavy ramp demand, and require significant changes in existing ramp metering operations if ramp metering continues to be used as part of freeway traffic management. Furthermore, researchers used computer simulation to compare the effectiveness of ALINEA with queue flush with the existing strategy of metering at the maximum rate with queue flushing. Researchers found that ALINEA does not provide any benefits when queue flushing is permitted. Under heavy demand conditions such as those in Houston, the current strategy to meter at the fastest rate remains the most beneficial. However, this strategy also provides limited benefits. Finally, researchers developed guidelines and recommendations for current and future ramp metering operations in Texas. This report documents the research results.
Implementation Of A Variable Speed Limit Ramp Metering Strategy To Increase Freeway Capacity At Metered On Ramps
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Author : Jorge Andrés Laval
language : en
Publisher:
Release Date : 2020
Implementation Of A Variable Speed Limit Ramp Metering Strategy To Increase Freeway Capacity At Metered On Ramps written by Jorge Andrés Laval and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Ramp metering (Traffic engineering) categories.
Optimization And Microsimulation Of On Ramp Metering For Congested Freeways
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Author : Gabriel Clemente Gomes
language : en
Publisher:
Release Date : 2004
Optimization And Microsimulation Of On Ramp Metering For Congested Freeways written by Gabriel Clemente Gomes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Express highway interchanges categories.
This dissertation investigates various aspect of the design and testing of on-ramp metering control systems, including optimization-based control and microscopic freeway modeling. A new technique for generating optimal metering plans is developed. As with most predictive designs, the ramp metering rates are found as the solution to a nonlinear optimization problem. In contrast to previous designs, the new approach 1) produces a globally optimal solution to the nonlinear problem, 2) requires only to solve a single linear program, and 3) allows the enforcement of hard constraints on the on-ramp queue lengths. The price that is paid for these features is that the objective function being minimized is not Total Travel Time, but rather a member of a class of "TTT-like" objective functions. A TTT-like objective function is defined as a linear combination of mainline flows with weights that, similarly to the Total Travel Time cost weights, decrease linearly in time from some initial value to zero at the final time. An example application of the technique shows that the globally optimal metering plan with respect to a TTT-like objective function also performs well in terms of Total Travel Time. A macroscopic analysis of local traffic-responsive ramp metering on a short stretch of freeway, with a single on-ramp and no offramps, is also presented. The study compares the performance of two popular local traffic-responsive ramp metering algorithms: Alinea and Percent-Occupancy, and addresses issues pertaining to parameter tuning and loop-detector placement. The second half of the dissertation describes the construction of a detailed microsimulation model of a stretch of Interstate 210 in Pasadena, CA. The VISSIM microsimulation package was used to create this model. Descriptions of the data gathering and processing procedures, bottleneck identification, network coding, and model calibration are provided. The model is used to test the performance of candidate local traffic-responsive controllers. Questions concerning the relative merits of these controllers, parameter tuning, and loop-detector placement are addressed in the context of the large-scale microscopic model.
Algorithm Design User Interface And Optimization Procedure For A Fuzzy Logic Ramp Metering Algorithm
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Author : Cynthia E. Taylor
language : en
Publisher:
Release Date : 2000
Algorithm Design User Interface And Optimization Procedure For A Fuzzy Logic Ramp Metering Algorithm written by Cynthia E. Taylor and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Fuzzy algorithms categories.
Evaluation And Improvement Of The Stratified Ramp Metering Algorithm Through Microscopic Simulation
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Author : Panos G. Michalopoulos
language : en
Publisher:
Release Date : 2005
Evaluation And Improvement Of The Stratified Ramp Metering Algorithm Through Microscopic Simulation written by Panos G. Michalopoulos and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Computer algorithms categories.
A new ramp metering strategy implemented on the Twin Cities freeway system to reduce ramp waiting times was evaluated through microsimulation of freeway activity. The study compared Stratified Ramp Metering strategy with the previous Zone Metering Strategy and with no control strategy. Comparison with Zone, which was designed to favor freeway flow, showed the new strategy succeeded in greatly reducing ramp delays and lines. When compared to the results of no control strategy, it reduces freeway travel time, increases freeway speed, smoothes the flow of traffic, and reduces the number of stops. However, travel time, fuel consumption and pollutant emissions are unpredictable under the newer system. Compared to no control strategy, such measures of effectiveness may improve or worsen depending on the freeway patterns and demand. Based on these findings, the researchers will seek improvements to the design of the Stratified Ramp Metering algorithm so as to factor in disruptive traffic patterns.
Preparations For Field Testing Of Combined Variable Speed Advisory Vsa And Coordinated Ramp Metering Crm For Freeway Traffic Control Phase I
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Author : Xiao-Yun Lu
language : en
Publisher:
Release Date : 2014
Preparations For Field Testing Of Combined Variable Speed Advisory Vsa And Coordinated Ramp Metering Crm For Freeway Traffic Control Phase I written by Xiao-Yun Lu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Electronic traffic controls categories.